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LETTER TO THE EDITOR

Photon energy dependence of ionization-excitation in helium at medium energies

R Wehlitz et al 1997 J. Phys. B: At. Mol. Opt. Phys. 30 L51-L58   doi: 10.1088/0953-4075/30/2/004  Help

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R Wehlitz-+, I A Sellin-+, O Hemmers++, S B Whitfield++, P Glans++, H Wang++, D W Lindle++, B Langer§, N Berrah§, J Viefhaus|| and U Becker||
-+ Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA
++ Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003, USA
§ Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008-5151, USA
|| Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4 - 6, D-14195 Berlin, Germany

Abstract. We have measured the photoionization-excitation-to-photoionization ratio for (n = 2 - 6) at several photon energies from 90 to 900 eV. By extrapolating these values we could determine the asymptotic high-energy ratios for (n = 2 - 5) which agree with theoretical predictions. We show that the satellite-to-main-line ratios are consistent with experimental double-to-single photoionization ratios and agree well with recent measurements.

Print publication: Issue 2 (28 January 1997)
Received 25 October 1996

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